R&B singer Kehlani was placed on a psychiatric hold in L.A. yesterday — after emergency responders arrived to her Hollywood home and determined she posed a threat to herself … TMZ has learned. – We’ve learned … paramedics responded to a medical emergency at Kehlani’s home at 1:45 PM on Monday — and when they arrived we’re told “she wanted to harm herself.” – Law enforcement sources tell us … Kehlani was placed on a psychiatric hold and transported to a nearby hospital for a mental evaluation. – Kehlani has already said she was considering killing herself in the wake of rumors she cheated on NBA star Kyrie Irving … although Kehlani has adamantly denied that. – Kehlani has posted pics from her hospital bed saying she’s grateful to be alive … adding, “God saved me for a reason.” – No word on how long doctors plan on keeping Kehlani … but sources close to the singer tell us, “She’s doing much better.” – Multiple calls to Kehlani and her camp have not been returned. – Source: TMZ